This hair spa cap is safe to use and convenient. It is an indispensable tool for nursing your hair at home. it is a fire-retardant electronic temperature control heating cap. The inner embedded plastic film is waterproof and anti-electricity, and it is washable removable and convenient. Two levels of temperature control, you can switch to your preferred temperature. Flame retardants is safer. It is an indispensable tool for nursing your hair at home